The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 06, 2011
Filed:
Oct. 17, 2008
Akihiko Komatsu, Hamamatsu, JP;
Akihiko Komatsu, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu-shi, JP;
Abstract
A keyboard apparatus includes plural keys, electronic actuators, reflection plates, and optical sensors. Each key extends in the longitudinal direction and pivots in the vertical direction about a support in accordance with key depression and release. Each electronic actuator has a movable member that displaces vertically when interlocking with a key's pivot movement so as to apply a reaction force against key depression. Each plural reflection plate is fixed to the electronic actuator's movable member, wherein the reflection surface faces the lateral direction of each of the keys. The light reflectance changes along the displacing direction of the movable member. Each optical sensor is arranged apart from the longitudinal axis of the keys in the lateral direction. It emits light toward the reflection plate and receives the reflected light from the reflection plate so as to output an electric signal according to the quantity of received light.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile